Question

我希望这两个SELECT查询给出一个结果然后我想按date_time

排序

SELECT 1：

"SELECT * FROM `table` WHERE `f_id` = '$uid' AND `t_id` = '$pid'"

SELECT 2：

"SELECT * FROM `table` WHERE `f_id` = '$pid' AND `t_id` = '$uid'"

我试着将它放在一个WHERE子句中，但这是不可能的，我也尝试将它们放在子查询中但是这使得SELECT 2加入了正确的SELECT 1：/我想要这两个查询的一个输出数组，排序方式date_time。怎么可能？

Answer 1

SELECT * FROM `table` WHERE `f_id` = '$uid' AND `t_id` = '$pid'
UNION ALL
SELECT * FROM `table` WHERE `f_id` = '$pid' AND `t_id` = '$uid'

编辑：

呃...对不起，我没有看到它是同一张桌子。

SELECT * FROM table
  WHERE (`f_id` = '$uid' AND `t_id` = '$pid') OR (`f_id` = '$pid' AND `t_id` = '$uid')
  ORDER BY date_time

Answer 2

怎么样：

SELECT 
    * 
FROM 
    `table` 
WHERE 
    (`f_id` = '$uid' AND `t_id` = '$pid') OR 
    (`f_id` = '$pid' AND `t_id` = '$uid')
ORDER BY 
    `date_time` DESC

Answer 3

试试这个

   SELECT * FROM 

      ( select * FROM `table` WHERE `f_id` = '$uid' AND `t_id` = '$pid'
       union all 
        SELECT * FROM `table` WHERE `f_id` = '$pid' AND `t_id` = '$uid' )t

   ORDER BY date_time

mysql 2在一个查询中选择SELECT

3 个答案: